Electrical Connections; Connecting Components - Tecumseh SILENSYS Montageanleitung

WARNING
To maintain the quality of a TECUMSEH EUROPE condensing unit and
to ensure it functions correctly, the following precautions must be taken:
- Protect the casing whilst brazing pipework,
- Purge the system with nitrogen whilst brazing,
- Insulate the suction line up to the compressor inlet with
anti-condensation pipe insulation.
See Appendix 1, page 30 to 31 for the refrigeration connections.
Make sure to insulate the suction pipe work to limit the suction
superheat. For low temperature applications, we advise using a
minimum of 19mm thick insulation.
Tape the cables together with vinyl adhesive tape and clip them to
the wall. Be careful not to damage the insulation of the cables
during the installation. A cable tray which conforms to NF C15-
100 and is separate from the refrigerant lines is recommended.
General design principles for pipework
Suction pipework
Suction pipework returns refrigerant gas to the compressor from
the evaporator. In practice, the suction pipework should be
designed to limit the pressure drop.
An oil separator prior to start up prevents the return of liquid
refrigerant to the compressor during the off cycle.
Two non-return valves are fitted on the condensing unit, one
upstream of the separator, one downstream.
Liquid pipework
Pressure drop in the pipework must be prevented. The components
fitted to the liquid line such as the filter drier, solenoid valve, liquid
line sight glass can have a pressure drop which is significant.
The pressure drop per component should be checked to ensure it
is not excessive.
The design of rotary compressors makes any emptying or refilling
of refrigerant charge impossible.
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3.8. Electrical connections

Ensure the electrical supply is disconnected before
carrying out any wiring or repairs of the unit.
All cabling on site must conform with NF C15-100 in
WARNING
France or to the current legislation in the country in
question (IEC 60204/IEC 60335). According to
IEC60335, the degree of pollution is 3.
To ensure the quality of a TECUMSEH EUROPE condensing unit, it
is essential to:
- Check that the installation power supply voltage is compatible
with that of the condensing unit (see identification plate).
| Installation Instructions
- If the compressor is
located higher than the
evaporator, suction risers
must be used. Pipeline
velocity must be sufficient
to ensure oil flow in the
suction risers.
- If the compressor is on the
same level or lower than the
evaporator, we recommend
that swan neck suction line
is used where the top of the
swan neck is above the
evaporator.
Discharge pipework
- Check the compatibility of the wiring diagram with that of the
installation.
- Size the cables (power and control circuits) according to the
specifications of the condensing unit installed.
See table of current ratings in the Electrical Data Instructions
- Ensure that the power supply to the unit is correctly protected
and earthed.
- Ensure that all electrical connections conform to the local
standards and follow recommended best practice.
- Ensure that the unit is earthed when replacing components.
- It is recommended to add a phase controller on the power
supply of Scroll compressors.
Like the protector, it is vital to use the relay delivered with the
compressor, even if another model seems to be satisfactory at a
given time. All the compressors in the TECUMSEH EUROPE range
are protected by an external or internal protection mechanism, for
which the principle is based on a current /temperature
combination. Like any protection mechanism, it is normal for it to
disconnect the compressor's power supply outside the normal
usage ranges provided by TECUMSEH EUROPE.
■

3.9.Connecting components

Please refer to the wiring diagram (refer to Silensys' electrical data
instructions ) when connecting components.
• Connect all control and safety devices fitted to the unit.
• Secure wiring using the clips fitted to the condensing unit.
• Close the electrical box after wiring.
4- START UP
Our compressors are designed to operate at a maximum ambient
temperature of 46 °C. Do not exceed this temperature.
To optimize the quantity of refrigerant in the installation, respect
the cooling rules of the art.
For the different conditions of use of the compressor, do not
exceed its maximum service pressure (see identification label).
If there is a single-walled tube between the water and the
refrigerant (e.g.: water evaporator) and if a leak occurs through
this wall, the refrigerant leaks outside and water enters the
system, creating a vapour effect. Without a safety device, the
compressor will behave like a vapour generator and the motor's
heating will generate a high increase in pressure.
The disintegration of the insulator (glass bead) on one of the
compressor's electricity supply terminals following a physical
impact may create a hole through which the refrigerant and some
oil may escape. If it comes into contact with a spark, this mix may
catch fire. Regardless of the work being carried out on the cooling
system, simply positioning the electrical unit cover correctly will
protect against this type of risk.
Avoid very corrosive or dusty environments. If the installation is
shut down for a lengthy period, you are strongly advised to bring
the cooling fluid into the tank when the condenser unit has one.
The aim of this operation is to avoid the refrigerant migrating to
the compressor and any concentration of fluid within the
lubricant that may cause liquid slugs during recommissioning.
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